I would guess that it is 'service mark' however, there are many choices... Acronym Definition SM Service Mark SM Square Miles SM Statute Mile SM (USN Rating) Signalman SM Directorate for Systems Management SM Master of Science SM Sa Majesté (French: His/Her Majesty) SM Sado-Masochism SM Safeguards Measurements SM Sailor Moon (anime) SM Saint Marc (French School; Alexandria, Egypt) SM Sales Manager SM Samarai SM Samarium SM Samsung Motors SM San Marino SM Santa Maria (California) SM Santa Monica (California) SM Sarao Motors (manufacturer of passenger Jeepneys in the Philippines) SM Satellite Modem SM Scanning Mode SM Scarlet Monastary (World of Warcraft game) SM Scatterable Mine SM Scattering Matrix SM Scheduled Maintenance SM Schistosoma Mansoni SM Sclerosis Multiplex (Latin: Multiple Sclerosis) SM Scoutmaster (Boy Scouts of America) SM Script Mode SM Seamless Mobility SM Secondary Mirror SM Secretaría de Marina (Spanish: Secretariat of the Navy, Mexico) SM Secretary's Memorandum (US DoD Joint Staff) SM Security Management SM Security Manager SM Security Manual SM Security Monitor SM Segundamano (second hand bargain stores in the Philippines) SM Seine Majestät (German: His Majesty) SM Selective Media (cell plating) SM Self-Mutilation SM Selling Manager (Ebay selling tool) SM Semiconductor Manufacturing SM Senior Manager SM Senior Member SM Senior Minister SM Sensitivity Measure SM Separation Module SM Sequence Monitor SM Serbia and Montenegro SM Sergeant Major SM Serial Magnitude SM Serratia Marcescens SM Service manager (US DoD) SM Service Member SM Service Menu SM Service Module (power/propulsion section of US Apollo spacecraft) SM Service Module (Russian-made unit No 2 of International Space Station) SM Servicing Mission SM Servomotor SM Set Mode SM Seung Mina SM Shader Model SM Shading Model (change detector) SM Shanghai Municipality SM Shared Memory SM Shawn Marion (NBA Player) SM Shawn Michaels (Pro Wrestler) SM Sheet Metal SM Shigeru Miyamoto (video game producer) SM Shipping Manifest SM Shoals Music (music industry magazine) SM Shoemart (Manila, Philippines) SM Shoot Me SM Shopping Mall SM Short Message SM Short Meter (hymnology) SM Shrine Mont (Orkney Springs, VA) SM Shure Microphone SM Shuttle Mission (NASA) SM Siemens Metering AG SM Silhouette Mirage (video game) SM Silver Medal SM Silver Medallion (Delta Sky Miles) SM Simple Machine SM Simple Minds (band) SM Single Manager SM Single Mode SM Single-Family and Multi-Family (zoning) SM Singlemode SM Skim Milk SM Skymiles (Delta Frequent Flyer Program) SM Skyscraper Museum SM Slam Magazine SM Slave Master SM Slave Motor SM Smagorinsky model SM Small (size) SM Small Manufacturing SM Smart Media (data storage) SM Smart Munitions SM Smash Mouth (band) SM Snail-Mail SM Snooker Master (USDAA dog agility title) SM Social Mobility (sociology) SM Societas Mariae (Society of Mary, Marianists, religious order) SM Society of Mary (Marists, religious order) SM Soft Money SM Software Manager (KPA of CMM commonly used by SEI) SM Soil Moisture (agronomy) SM Solar Mass (astronomy) SM Solder Mask (semiconductor process) SM Soldier's Manual SM Soldier's Medal SM SONET Multiplexer (Alcatel) SM Song Meanings SM Soo Man (record company) SM Soul Man (song) SM Soul Master (gaming) SM Soul Mate SM SourceMod (gaming) SM Space Mapping SM Space Marine (Warhammer 40k) SM Space Mirror SM Space Mountain (Disney park) SM Spare Me SM Spatial Multiplexing SM Special Mention (variant of OAEM and OLEM) SM Special Message SM Special Missions SM Special Monthly SM Specification Manual SM Spectrum Management SM Sperm Measurement SM Sphingomyelin (protein) SM Spider Man SM Spiderman SM Spinal Meningitis SM Splash Mountain SM Sponge Minion (Harry Potter) SM Spontaneous Mutation SM Sports Medicine SM Sprung Monkey (band) SM Square Meter SM Stable Member SM Stable Memory SM Staff Meeting SM Staff Member SM Staff Memorandum (JCS) SM Staff Month SM Stage Manager SM Standard Missile SM Standard Model (physics) SM Standard Smoker (insurance) SM Standards Manual SM Standby Monitor SM Stanley Morgan (brokerage firm) SM Star Museum (Entertainment; South Korean entertainment company) SM Stardust Memory (Gundam) SM State Machine SM Station Master SM Statistical Multiplexing SM Steele Matrix SM Step-Mom/Mother SM Step/Stepping Motor SM Stepmania (dance simulator) SM Stick Man SM Stipendiary Magistrate (Australia and New Zealand) SM Stock Market SM Stormed SM Strategic Missile SM Street Modified (automobiles) SM Streetlight Manifesto (band) SM Strong Mad (homestarrunner.com character) SM Structural Model SM Structure Model SM Student Manager SM Study Manager SM Styrene Monomer SM Su Majestad (Spanish: His/Her Majesty) SM Sub-Memory SM Submarine SM Suger Montano (Guatemala Central America, school) SM Suomen Mestari/Mestaruus (Finnish Champion/Championship) SM Super Mall (Philippines) SM Super Mario (Nintendo game) SM Super Metroid (game) SM Super Metroid (video game) SM Superman SM Supervisor Manual SM Supply Manual SM Support Manager SM Surface Mount SM Surge Margin (compressor aerodynamics) SM Surgical Margin SM Swine Mycoplasmosis (swine enzootic pneumonia) SM Switching Module SM Swollen Members (band) SM Synchronous Motor SM Synchronous Multiplexer (Alcatel) SM Synthetic Media (cell plating) SM Syringomyelia (Cavalier King Charles Spaniel) SM System Management SM System Manager SM System Monitor SM Systems Management